Deuteronomy 3:12-13

12“So we took possession of this land at that time. I gave the territory from Aroer, which is by the valley of the Arnon, along with half of the hill country of Gilead and its cities to the Reubenites and to the Gadites.

13The rest of Gilead and all of Bashan, the kingdom of Og, I gave to the half-tribe of Manasseh, that is, all the region of Argob (concerning all Bashan, it is called the land of Rephaim.